Fixed issue #543. Detail loses details.

--HG--
branch : release

ChangeLog.txt

@@ -16,6 +16,7 @@
 - [#532] Unexpected error occurs when zoom out image.
 - [#537] Valentina crashes when use undo command.
 - [#544] Error: Color Lines are black until touched.
+- [#543] Detail loses details.
 
 # Version 0.4.4 April 12, 2016
 - Updated measurement templates with all measurements. Added new template Aldrich/Women measurements.

src/libs/vgeometry/vgobject.cpp

@@ -35,6 +35,8 @@
 #include <QtCore/qmath.h>
 #include <climits>
 
+double VGObject::accuracyPointOnLine = (0.5/*mm*/ / 25.4) * PrintDPI;
+
 //---------------------------------------------------------------------------------------------------------------------
 /**
  * @brief VGObject default constructor.
@@ -499,14 +501,16 @@ double VGObject::PerpDotProduct(const QPointF &p1, const QPointF &p2, const QPoi
  * There is the floating-point accuraccy problem, so instead of checking against zero, some epsilon value has to be
  * used. Because the size of the pdp value depends on the length of the vectors, no static value can be used. One
  * approach is to compare the pdp/area value to the fraction of another area which also depends on the length of the
- * line e1=(p1, p2), e.g. the area of the square with side e1 which is computed below
+ * line e1=(p1, p2), e.g. the minimal area calucalted with PerpDotProduc() if point still not on the line. This distance
+ * is controled by variable accuracyPointOnLine
  */
 double VGObject::GetEpsilon(const QPointF &p1, const QPointF &p2)
 {
-    const double dx1 = p2.x() - p1.x();
+    QLineF line(p1, p2);
-    const double dy1 = p2.y() - p1.y();
+    line.setAngle(line.angle() + 90);
-    const double epsilon = 0.06 * (dx1 * dx1 + dy1 * dy1); //-V636
+    line.setLength(accuracyPointOnLine); // less than accuracy means the same point
-    return epsilon;
+
+    return qAbs(PerpDotProduct(p1, p2, line.p2()));
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vgeometry/vgobject.h

@@ -89,6 +89,8 @@ public:
 
     static QVector<QPointF> GetReversePoints(const QVector<QPointF> &points);
     static int GetLengthContour(const QVector<QPointF> &contour, const QVector<QPointF> &newPoints);
+
+    static double accuracyPointOnLine;
 private:
     QSharedDataPointer<VGObjectData> d;